Means for preventing self-sealing of fluid-distended flexible tubes during exhaustion.



PATUNTED JUNE 25.19571 J. M. BOYLE. MEANS POR PREVBNTING SELF SEALING 0F FLUID DISTENDBDFLE XIBLE TUBES DURING EXHAUSTION.

APPLICATION FILED FEB. 20, 1907.

UNITED STATES4 PATENT OFFICE.

JAMES M. BOYLE, OF NEW YORK, N.

A CORPORATION OF NEW YORK.

MEANS FORl PREVENTING SELF-SEALING-OF FLUID-DISTENDED FLEXIBLE TUBES DURING EXHUSTION.

conrANY,

rY., ASSIGN OR TO MON OLITHIO DUCT Specification of Letters Patent.

Patented June 25, 1907.

` i Application filed February 20, 1907. Serial No. 358,424.

To til whom, t may concern:

Be it known that I, JAMES M. BoYLE,`a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Means for Preventing Self-Sealing of FluideDistended vFlexible Tubes During Exhaustion, of which the following is a specification.

The invention relates to tubes of flexible material capable of being dis tended by internal fluid pressure and consists in combination with such a tube of means for preventing local collapse of the same at some point` along its length and consequent self sealing of the tube beyond said point during the removal of the distending fluid therefrom.

In the accompanying drawings-Figure l is a longitudinal section of a finished monolithic conduit, with the flexible tube therein in infiated condition forming the molding core of said conduit, and connected with an air pump preparatory to deflation and removal. Fig. 2 is asimilar section showing the possible behavior of said tube during deflation. Fig. 3 is a perspective view of a part of the tube showing my device in place. Fig. 4 is a longitudinal section of the tubular core and part ofthe finished conduit, the core section being on the line x of Fig. 3.

Similar numbers of reference indicate like parts.

I herein show my invention applied to the tubular core of a monolithic cement conduit such as described in U. S. Letters Patent N o. 830,204, granted to me September 4, 1906.

Where the core is of considerable length it is often found necessary to remove the air therefrom by an air pump so as to cause a deflation of the core sufficient to enable it to be conveniently withdrawn from the conduit bore. Thus in Fig. 1 is the infiated tubular core of flexible material of indefinite length embedded in the completed monolithic cement conduit 2, and closed at both ends by plugs 3. Through the plug 3 at one end passes the pipe 4 leading to the air pump 5, by means of which pum the deflation is performed. I have found, owever, in practice, that under these conditions the core does not walls of the `,rib are provided with openings 9 communicating `with the interior thereof. Any desired number of said ribs may be used, three being found preferable, since in this way the sealing of the core above described s provided for, no.matter how it may colapse.

When the collapse at any given point as 6 occurs, the depressed wall of the core meets a rib on one of the strips, as shown in Fig. 4. This rib being of sufficiently resisting material is not then pressed outward sufficiently to close its bore, which thus establishes constant connection between the portions of the core on each side of the seal formed; hence, the air otherwise im risoned on the side 7 beyond the seal is easilp by the arrows in Fig. 4 through the hollow rib bore, its wall and openings. The sealing effect of the collapsed portion 6 is thus neutralized and the core throughout its whole length is easily deflated.

Although I have described my invention as applied to the distensible core of a molded cement conduit, it is obviously applicable to any fluid distended tube from which the fluid is to be removed by means similar to that described.

I claim l. A distensible tube of flexible material, means connected to one end of said tube for exhausting distending fluid therefrom and means for reventing local sealing of said tube by colihpse thereof at a point between said exhausting means and the other end of said tube.

2. A distensible tube of flexible material and, secured on the inner periphery of said tube, a hollow longitudinal rib having openings in its wall.

3. A distensible tube of exible material y drawn out as indicatedv In order to prevent this I secure by any l 'roo and7 secured on the inner periphery of said tube, a plurality oi hollow longitudinal ribs, each having openings in its wall,

4. In combination with a tube of' flexible material distended by internal fluid pressure and a longitudinal hollow rib having openings in its wall secured on the inner periphery of' said tube7 means connected to one end of said tube for removing the distending luid therefrom. i o In testimony whereof I have ai'lixed my signature in presence of two witnesses.

JAMES M. BOYLE. itnesses WM. H. SIEGMAN,

GERTRUDE T. PORTER. 

